Grinding-machine.



A. B. mums.

' GRINDING MACHINE. APPLICATION FILED NOV. 20, 1909.

1,15,567 Patented. Jan.23,1912.

11 SHEETS-SHEET l.

A. B. LANDIS.

GRINDING MACHINE.

APPLIGATION FILED NOV. 20, 1909.

Witness Patented Jan. 23, 1912.

11 SHBETSSHEE T 2;

A. B. LANDISQ GRINDING MACHINE.

APPLICATION FILED NOV. 20, 1909. l @1 56? Patented Jan.23, 1912.

11 SHEETS-SHEET 3.

A. B. LANDIS.

GRINDING MACHINE.

APPLICATION FILED NOV. 20. 1909.

11 SEEETS SHEET 4.

Patented Jan. 23, 1912.

Zinnia/"ton 2X tmzooea A. B. LANDIS.

GRINDING MACHINE. APPLICATION FILED NOV. 20, 1909.

Patented. Jan.23, 1912.

11 SHEETS-SHEET 5 um-Mon A. B. LANDIS. GRINDING MACHINE. APPLIOATION FILED NOV. 20, 1909.

Patented Jan. 23, 1912.

11 SHEETS-SHEET 6.

MK $3 mm R lwamntfoz Wihwaom A. B. LANDIS. GRINDING MACHINE. APPLIGATION FILED NOV. 20, 1909.

1 ,015,567: Patented Jan.23, 1912.

11 SHEETS-SHEET 7.

,Patented; Jan. 23, 1912.

11 SHEBTS-SHEET 9 smnnfoz attains A. B. LANDIS.

GRINDING MACHINE. APPLIGATiON FILED Nov. 20, 1909.

wammeb Patented Jan. 23, 1912,

11 SHBETSSHEET 10.

A. Br LANDIS.

GRINDING MACHINE.

APPLICATION FILED NOV. 20, 1909.

11 SHEETS-SHEET 11.

A WITNESSES.-

UNITED STATES PATENT OFFICE;

ABBAHAM B. LANDIS, OF W AYNESB,OB2O, PENNSYLVFNIA.

GRINDING-MACHINE.

To all whom it may concern Be it known that I, ABRAHAM B. L mms, i=1 a citizen of the United-States, residing .at'

\Vaynesboro, in the county of Frankl Grinding-Machines, of which' the following is a specification.

The object .of my said invention is to provide a grinding machine'for grinding plane surfaces which shallbe automatic-in the 0peration of its traversing and feeding mechanism and accurate and positive in its Work, and it consists in various'im'provements in the construction and arrangement, of parts of such a machine whereby these objects are accomplished, all as Wlll be hereinafter more fully described and claimed.

' Referring-to the accompanying which are made apart hereof and on w similar reference. characters indicate similar parts, Figure l is a perspective view of the front side of a grinding machine embodyin my said invention, Fig. 2 a similar view o the rear side, Fig. 3 an elevation of the front side of the machine'jFigQ i an elevation of: the rear side with a portion of one end of the bed broken away, Fig.'5"a-cross outside corner of each side gutter.

er edges are wound upon a roller B which roller is mounted bymeans of: pins section on the dotted line 5-5 and at, Fig. 6 a horizontal section on the from the dotted line 88 in shown in Fig. 9, Figs. 15-, 1 6 and 17 detail. engagement offheir pins with the perforaviews illustrating, onan enlargedscale, the tions. When it is desired to adjust said Specification '0; Letters Patent.

' Application filed'Noveni in and .State of Pennsylvania, have invented certain new and useful Improvements in drawings in Figs. 3 upp or 20, 1909. Serial No. 529,151.

b and b in its ends in corrcspondin 7- 7 fora-tions in the uprights b and b. Pimons in Fig. 4, Fig. 8 a detail elevation looking I) and b are mounted on said pin 7) and b in the direction indicated by the arrows ig. 7, Fig. 9

a detail view partly in section as'seenwhen shown in Figs. 20 and 21 the ,water-guar looking in the direction indicated by the c'urtainsare adjusted to about one-half the arrows from the dotted line 9--9 in Fig. 6, height of the upright 72 and b the pinions Figs.10,11,12,13 and 14 detail views illustrating differentparts of the mechanism rollers held at the desired levation. by the formed adjacent to the perforations.

Patented Jan. 23, 1912.

- tainsjthe bearings and supports for the operating parts. It is formed on its top with longitudinal ways for thework-carriageB.

The work-carriage B is a table of appropriate form on which the work W (see Fig. 1) may be secured by clamps b and is formed with longitudinal ribson its under side of appropriate form to run in the ways formed therefor in the top of bed A. In the central portion of its under side it has a longitudinal-rack-bar B, secured thereto for engagement with the'traversing gear. It is formed with appropriate side gutters b communicating through channels b with a wastewater cutter-B At each end it is provided with an end-guard B formed with upright side pieces'b and b. A series of perforations are formed in the inner faces of'said' upright side pieces at one end of the cars hich riage and vertical grooves in the adjacent faces of the uprights are formed rack-bars.

The construction on each side of the bed being a duplicate of the other only one side need be described. The water-guards con- .sistofflexible curtains B mounted at one end on a longitudinal rod 6 extending from end to end of the work-table in the upper Their and engage with the teeth of the rack-bars being engaged in the rack-bars and the crank-rod connection shown at the" lower water-guards up or down, the roller B may side of Fig. 1, Figs. 18 and 19 detail views be slid toward the end containing the pin illustrating the belt-shifting devices shown in Fig. 2, Figs. 20 and 21 detail views illi strating the water fenders used in connection with the grinding bed, and'Fig. 22' a cross with the pinion in engagement with-the section on the dotted line 22 22 in Fig.6; rack-bar, which insures a n-even-adjust1ncnt of bothends of said roller. 'When the ele vation desired has been secured the pin 6 is allowed to reengage with the adjacent perforation which will hold the roller at the ing of point desired the other end being in posi tion by engagement of the iiuion with the rack-bar'and the on seaward. of the pin 7) In said drawings the portions ma represent the bed or frame of the machine, B the work-carriage and C the pivoted rked A 6'; which is sprin -mounted and adapted to slide sufficiently to disengage the pin 1), when said roller can be rolled up or down behind the outside flange of the groove. In r the top of uprights A A and A secured to the opposite sides of-the bed A and to the transverse portion A in said bed. The

finding wheel G is mounted on a shaft. 1

ourna led in suitable bearin in the front end of said frame. Said sha t is coupled by suitable and, somewhat flexiblecoupling mechanism contained in easing c to a shaft 1 which is m'ounted'to slide in bearings in aframe C 'mounted on pivot-shaft C between the standards A andjA on transverse frame A. The rear end-of said frame C is weighted, as shown, so that it will nearly balance on said pivot-shaft. Another frame or a hood G? is mounted on pivot-shaft C between the standards A and A extending over the front part of frame C to cover the feeding t mechanism and onits front has a bearing face-or-track 0 against which a shoe 0*, on

frame G is adaptedto bear.- The' rear end of said'frame C is weighted, as shown, the

:wei ht normally holding shoe 0 against trac 2. A segment 118 is formed on the rear end of pivoted frame C and a corresponding segment 218 on the rear end of hood C both formed with gear teeth and in line with each other for engagement with pinions 117 and 217 on a shaftc forming part of theadjusting gearing, to be hereafter described. Frame G is mounted not only to pivot, but also to traverse transversely on said shaft C to carry the grinding-wheel step by step across the work, the traversing 'movement eing effected at each end of the travel of the work-table, as will be presently described. v

The grinding-wheel shaft 1 through shaft 1 is belted by means of a pulley 2 on shaft 1* and a belt 3 which runs over an idler pulley 4 on the pivot-shaft to a pulley 5 on the main driving shaft 6, which is provided a with a belt pulley 7 by which the power for driving the machine is connected therewith. Said main driving-shaft 6 is connected by various belts and gearing to the driving shafts of the several sets .of feeding mechanism so that the entire machine is operated from one main driving-shaft. Said main driving-shaft 6 isprovided with a cone 'g.

pulley 8 geared by a belt 9 to a cone-pulley I 10 on a counter-shaft 11 journaled in suitable bearings on the frame. Another pulley "-12 adjacent to cone-pulley 10 is connected by a belt 13 with a pulley 14 on acounter-shaft 15 mounted in bearings carried ina yoke 16 secured to the rear side of bed A.- Adjacent to said pulley-14 an idler pulley 17 is mounted on said counter-shaft 15 and another pulley 18 of largerdiameter is also mounted on said shaft with an idler pulley 18 and 18, respectively, of the same diameter on either s1de thereof. Astraight belt 19- runs from said pulley 18, or is supported on an idler pulley alongside thereof, to a pulley 20 on a counter-shaft 21 journaled in bearings in the frame alongside shaft 11 and above the main driving-shaft 6. Another cross belt 22 is also mounted on said pulley 18, on one of the idler pulleys alongside thereof, .on the shaft 15 and runs to said pulleyv 20. Said pulley 20 is also formed witha cone part 23 by which shaft 21 may be connected by a belt 24 with a cone-pulley 25 on shaft 26 mounted in bearings in the frame in line with the main driving-shaft 6 and connected thereto by differential v gearing comprising friction disks 27 and 28 on the adjacent ends of said respective shafts and friction gearwheels 29 engaging-between said disks and carried upon a'frai-ne '30 swiveled upon a vertical shaft 31 on which istinounted' a worm-wheel 32 with which a 'wffrm 33 on a rod 34 is adapted to engage. Said rod 34 is j ournaled in a bearing in a part of the frame 35 in which the vertical pivot 31 is also journaled and extends in horizontal direction through the bed A to the outside thereof where it is provided with a hand-wheel 36 by whichit may be turned and the angle of the friction-wheels 29 in relation to the disks 27 and 28 adjusted in the well known manner forchanging the speed of the shaft 26.

On the inner end of shaft 15 .is a pinion 38 arranged to mesh with a gear-wheel 39 on a hollow shaft 40 journaled in bearings in each side of the bed. A inion 41 is also centrally mounted on. sa'ld shaft 40 and meshes with a gear-wheel 42 on another cross shaft 43 journaled in-bearings in the sides of the bed. Said gear-wheel 42 meshes with a pinion 43 on a shaft 44journaled in bearings in one side of the bed and onthe' outer. end of which is mounted a. wheel casing .45 carrying a sliding crank-block 46 connected by a pitman rod 47 with a rack-bar 48 on itsupper end with the mechanism to actuate the gearing for traversing the grinding-wheel carriage across the work. Said ear-wheel 42 also-enga, es with the teeth 0 the rackbar B on eunderside of the work-car riage B for traversing the same back and forth.

A vertical rock-shaft 49 is mounted in .bearings in-a bracket 50 secured'to the'side of the bed A ja'nd has angular projecting rom its top' and r in different planes and in line with the edge of the. trayelling carriage B. 'On its f gwpg" arms '51 and .52 extending end it is provided with a crank-arm 53 which is pivoted at its outer end to the outer end of a rod 5 1 which is mounted to slide in the hollow shaft 10 ext-ending through from one side of the bed A to the other end and connected to a bar mounted to slide in a horizontal way in the rear side of yoke 16. Belt-shifting levers 5G, 57 and 58 are pivoted on. the slide portion of frame 16 and are provided with eyes on their outer ends through which the belts 18, 1t and 22 are threaded and by which said belts are shifted back and forth from the driving pulleys 1a and 18 to the idler pulleys along side, on the shaft 15. A. hand-lever 59 is provided on the top end of rock-shaft 49 by which it may be operated by hand, and dogs G6 and (31 are adjust-ably mounted in a longitudinal T-shaped groove in the edge of table B being secured by clamping bolts 6 and 7). and arranged one in the path of the anti-friction roller on the outer end of the arm 51 and the other in the path. of the anti-friction roller on'tlie outer end of arm 52, wherebythey are adapted to strike said arms as thecarriage passes, and one as it moves in one direction and the other as it moves in the other direction, and through the said rock-shaft it), lever 53 and rod slide the bar 55', moving the shifting levers- 5G, 57 and 58 to shift the belts and reverse the motion of the machine.

.v By referring particularly to Figs. 7, 18 and 19, as well as 2 and =1, the means for operating the shifting levers will be un derstood. The bar 55, as shown most clearly Fig, 18, is formed with cam slots 62 and 63, the outer ends of which are in a different horizontal plane from the inner ends, an angular oif-set being formed in said slots between their extreme and portions. '1 he lever 56 is mounted on-a pivot 64 which pivot has an anti-friction roller 65 mounted to run in the groove 63 of the bar 55. Said lever :36 is in theform of a bell-crank lever, with a horizontally extending arm 66 on its lower end formed with a perforation '67 in which a .pin 68 may beinserted so that its inner end will project into said 'slot (33. S set-screw 69 is provided in the side of the arm the inner end of which is adapted to engagewith a groove in said pin (38 for securing it in the correct position. Lever 57 is pivoted. on the backside of the front bar of yoke 16 on a pivot bolt 168 and has a horizontal arm extending 'outwardly from a bolt-1G9 having an anti-friction roller 70 on its inner end which projectsinto the slot (53 of the bar 55. The lever 58 is pivoted on the front side of the yoke,.16 on a pivot bolt 71 and has a perforation 72 in a'hori zontal projection alongside said pivot bolt into which the pin-68 may be inserj d when desired, as will be presently described known manner.

said pivot in which is mounted Pulley 18 on shaft 15 being a fast pulley and pulleys 18 and 18 being loose on said shaft and pulley 14 being fast and pulley 17 loose, it will be seen that the operation of the carriage back and forth can'be controlled so as to travel in both directions under the same speed, or travel, in one direction slowly and be returned rapidly, as follows: lVhen it is desired to traverse the carriage back and forth at the same speed, belt 18 will be thrown upon the loose pulley 17. The shifting lever 58 will be'in the position shown in Fig. 18 and the pin 68 inserted in the perforation 67 of the horizontal arm 66 of the lever 56. As the carriagereaches the limit of its movement and operates throughthe dog 60, or 61, mounted thereon to rock shaft. 19, and through the lever 53 to reciprocate the rod 54 and the sliding bar 55, it willbe seen that the shift ing levers reversal of the carriage to throw the belts 19 and 22 first one and then the other to the central driving pulley 18 and the one not driving to the appropriate loose pulley 18 or 18 ,-.so that first the carriage will be driven directly by the belt 19 and then reversely by thli crossv belt 22, traversing back and forth at-the same speed in each direction, which speed may be varied by turi'iing rod 34- by hand-Wheel 36 which will operate the difierential gear in thewell When it is desired to grind in one direction only the large pulley 18 may be used as the driving pulley for driving the carriage while the grinding Wheel is in operation and the small pulley 17 will,

be used as the driving pulley forreturmng the carriage quickly and when this arrangement is used the pin 68 is removed from the perforation in the horizontal arm of the lever 56 and inserted in the perforation in lever 58 so that the inner end of said pin will engage with the slot 63 in the sliding bar 55. In this arrangement thedever 56 is thrown to carry belt 19 onto the idler pulley 18 pin 68 of the crank-arm 66 of said lever having been removed. Said pin 68having been inserted in perforation72 with its inner endin slot 62 of bar 55, the horizontal arm of the lever. 58 now becomes a crankarm and the pin 68 its crank-pin so that a reciprocating movement of the bar 55 operates through the cam slot 62 toswi'ng said lever 58 at each movement of said bar and throwing the belt 13 back and forth from the idler pulley 17 to the fast pulley 14-, the shifting arm 57 being also moved.

simultaneously therewith to carry the belt 22 back and forth from the fast pulley 18 to the loose pulley 18 in the operation of the grinding wheel where it will remain, the crankcarriage transversely of the work-table, as

before stated, the C carrying the grinding wheel is mounted to slide transversely upon the pivot-shaft O, which is fixed in bearings in the tops of the brackets A A and A of the frame. Said frame O is of a form which will be best understood by an examination of Fig. 6 being formed with a central opening and having bearingblocks 0 and c, in which the bearings for the grinding wheel shaft are formed, secured to its forward end by a ball-and-socket arrangement, whereby said bearings may be readily alined and adjusted, the bearings be-' ing secured by screw-bolts 0 and 0 The rear end, as before stated, is weighted to counter-balance the grinding wheel shaft said shaft C it is formed with an upward projection having a transverse perforation in which is mounted a sleeve 75. A pinion 76 is formed on said sleeve adjacent to one face of the part of the'frameO and a nut 7 7 is mounted on its outer end, whereby said sleeve is held from longitudinal movement in said frame. Said sleeve is interiorly screw-threaded and a screwrod 78 is mounted therein. The outer-end of said rod extends through a horizontal perforation in the adjacent side of a hood G and has a pinion 79 loosely mounted thereon with which the rack-bar 48 on the rod 47 engages. On the extreme outer end of said rod 78 it is provided with a ratchet-wheel '80, fast therewith, with which the point of a spring pawl 81 engages. Said pawl 810 is pivoted 'on a disk 82 secured to the hub of pinion 79.

Alongside sleeve 75 another similar sleeve 81 .is mounted having a pinion; 820 bearing against the inner face of the frame and a nut 84 bearing against its opposite face to -hold I said sleeve from longitudinal movement while permitting its rotary movement. Said sleeve is also interiorly screw-threaded and a screw-threaded rod 83 is -mounted therein extending parallel to the screwthreaded rod 78, but the sleeve 810 and rod 83 are threaded in thereverse direction to sleeve 75 and rod 78. Said rods 78 and 83 are geared together by intermeshing pinions 85 and 86 secured just within the hood O lugs 89 on the top of frame (1 above and I midway between screw-rods -78 and 83.

Said pawl is-mounted to swing freely on sa d shaft .88 and-provided on oppositeends with angular points which are adapted to engagewith the teeth of one or the other of '-the' ratchetwheels 76 and .82 on screwthreaded s1eeves 75 and 81 on; the screwshafts 78 and 83.- The underside of'said will at all times be held into engagement with one or the other of said ratchet-wheels, which will thus be held from turning and hold its sleeve to serve as a nut in which its screw-rod 78 or 83 will operate to feed the fframe O back and forth upon the pivot-shaft (1. An arm 92 is secured rigidly on said rock-shaft 88 by means of a set screw 93 (see Figs. 6 and 22) and is formed with transversely' extending fingers 94 and 95 which project over the outer ends of the rocking pawl 87 Said arms 94 and 95 are somewhat higher than the backside of the pawl where they contact therewith so that arm 92 may rock slightly independent of said pawl.

details about to be described) the head of which projects out to one side thereof and engages with a transverse slot 97 in the adjacent end' of a rock-shaft 98, which is mounted in a bearing in a perforation in a boss 99 formed on top of frame 0 and extending at right angles to the bosses 89 so that said rock-shaft 98 extends at right angles to the rock-shaft 88. On the outer end of said rock-shaft 98 it is provided with a crank having a crank-pin 100 which is pivoted to the upper end of a lever 101 formed ball-shaped in its center and mounted in a vertical socket 102 in an adjacent part of the frame O. Another screw-rod 103 is mounted rigidly in a socket in the inner end of a rod 20 1 secured to have a limited sliding movement in a perforation in the adjacent end of the-hood G Said rod is provided with adjustable stop nuts 104 and 105 near the respective ends thereof and on opposite sides of the arm of the frame O through which the same extends. A cylindrical block 106 is mounted in a perforation insaid arm of frame C and'secured to move therewith in which is mounted a'sliding rod 107 which extends through a perforation in said blockto a short distance beyond each end thereof. Said rod 107 has a vertical notch in one side of its center ,with which the lower end of lever 101' engages. On opposite sides of said screw-rod 103 are formed other longitudinal sockets in' said block 106 (Fig. 10) extending from the opposite ends of said block in reverse directions to nearly the other end, and from their inner ends smaller perforations lead through to the opposite ends. Plungers 108'and 109 are mounted to slide in said smaller perforations, each plunger being formed with a head and inserted from the large'ends of the'nsockets so that said heads are on the'interior.

Coiled springs -110 and 111 are nenjlnted in the outer ends of said sockets. Said plungers 108 and 109 arein a position t'o'contactwith the stop nuts 104 and 105 on rod 103 as the carriage C traverses back and forth and are adjusted in position-to reverse the desired in the following manner:

at the point The parts being in the position'shown in Fig. 10'and the carriage moving in the direction indicatedby the arrow, plunger 108 will contact. with stop nut 104 and under the tension of spring 110 will shove the sliding rod 204 and the screw-rod 103 endwise until the nut transverse feed of the carriage or shoulder'114 thereon will contact with the face of the part'C which will limit. the longitudinal movement whenspring 110 Wlll compress until nut 104 will contact. with the projecting end of sliding rod '1'07, which will operate to tilt lever 101 on its central ball-bearing, rocking shaft 98 tlirough the crank connection therewith and by the engagement of. the end oftransverse slot 97" on one side of the center of said rock-shaft will operate to rockshaft S8 and throw the arm 92. t.o'contact with the disengaged end: of the pawl 87, rocking said pawl to disengage the end which has been in engagement and to'throw the point of its angle on its underside" across the point of the plunger 90, which, under the pressure of spring 91, will quickly throw the opposite end of said pawl into engagement with the other ratchet-wheel, thus lockingone nut 75,

or 81, and releasing the other, throwing the screw that has been idle into operation,

which serves to move frame C transversely,

thus reversing its direction. By adjusting nuts 104 and 105 the time of reversing may .be regulatedto suit the work, as will be 123, by which riphery of said wheel is readily understood.

On the outer end of carrying the screw-rod 103, block 115, in the outer face which is formed a vertical notch or recess 110. On the shaft C 217 engaging with'the teeth on'the curved rack-bars 1.1.8 and 213m the rear edges of the hood C and frame C r-espeetively. Said shaft C has a worm-gear 119 on its outer end within a shell, or casing, (17 with which a worm 120 on a transversely extending shaft 121 is adapted to engage. Said shaft 121 is journaled in hearings formed on the top of easing c. and has a crank-wheel on'its outer end, provided wit-ha crank-pin it'maybe operated. The peformed with fine notches, or serrations, and a pawl '124 on the outer end of a crank125'ona'crank shaft 1.26 engagestherewith. Said crank-shaft 126 is journaled in bearings formed on the top of the hub of the casing 0" and on its inner end is formedwith a crank-whichen 'end to said shaft by 134. Casing or frame 45 flange surrounding, said wheel and a plate '13:) is. secured thereon which engages back of a shoulder in said'wheel 133. Mounted in an annular recess'between saidwheel 133 pin 96 with thea circular flexible brake 136 'impingeiuponitheface of said wheel 133,

sliding part 20.4,v

is mounted a v are mounted pinions' 117 and ing block.v Said screw circumferential groove 145 with which a 120 gages in the vertical recess in the adjacent side of block 115 on the outer end of sliding rod 204. A spring 127 is connected at one a collar 128 secured thereon by a set-screw the other end of said spring engaging in the end of the bearing in which saidshaft is journaled', .the tension of the spring being adjusted to throw the' arm 125 carrying the pawl 124 upwardly its'upward motion being limited, by a stop screw 129 mounted in a screw-threaded per-v foration and adapted to be adjusted and secured by a jam nut 130 thereon.

' The lower end of rod 47 is formed screwthreaded and inserted in a screw-threaded perforation in ablock 131 which is pivoted on the crank-pin 46 mounted in block 132, which is mounted shaped slot in the face of casing 45 mounted on the outer end of shaft 44. The connect-ion between shaft 44 and casing 45 is as followsi (See Figs. 15, 16 and 17.) A wheel t0 Sttld a, pinfig 133 is secured rigidly 15 formed with a and the inner face 'ofthe flange of the frame being faced with-leather or other friction material 137. against a shoulder 238 within said casing and the other end bears against a cam'on one end of a pivot cam-lever 138.

Said lever is mounted upon a pivot bolt 140 in said frame and its outer end extends rear-" wardly into the path of a strike 141 on bed A to one side of'the'axis of shaft 44 and a sliding strike 142 on the other side. A'leafspring 143 surrounds said brake on its outside with one end hearing at a point 7/ under a flange on the stationary end of said brake while its other end is-provided with a. setscrew 8 adapted to screw against the proecting end 0 of said brake, by which the tension'of said spring may be regulated to'"-' seeure the grip desired for said brake. The

sliding block 132 is adjustable radially by means'of'a screw 144 engaging on one sidewith screw-threads in the casing 45 and on its other SltlO with screw'threads in said slid-" the position of said block 132 in relation to the axis of shaft 44 may be regulated to secure the length of throw desired for the rod H 47: Stop142 is connected by abar 148 with a handle 149by which said stop may be slid out through the side of bed A in which it is 1'30 to slide in a dove-tail" adapted {to 95 one end of said brake heal-s 144 is formed with a 'part as follows:

- In the operation of the machine, when it is desired to feed the grinding wheel transversely of the work at each end of the longitudinal movement of the work-carriage,

i said strike 142 will he slid into escape lever 138. -Then, during the operation of shaft 44 through the medium of the gear connecting it to the gear-wheel 42, which operates the work-carriage, thecasing 45 is revolvedand being held to the wheel 133 by the brake- 136 will revolve with the shaft 44 until said lever 138 contacts with strike 141. Said strike, will throw said lever on its pivot-140 and through the cam, bearing against the end e of said brake, will open said brake against the action of the spring 143 and release the casing 45 from driving contact with the wheel 133, which will continue to revolve until the direction-of the work-carriage is reversed by the contact of one of the dogs 60 or 61 thereon with one of the arms 51 or 52 on the rock-shaft 49, and the shift- .ing of the belts and reversalof the move- .ment of the carriage, as before described.

,As soon'as the carriage starts in the reverse direction shaft 44 also startsto rotate in the reverse direction and the lever-138 is moved Y away from'stop' 141'when the spring 143 will lose the brake 142. onto the wheel'133, which will then turn casing 45 to operatec the rod 47, the rack-bar 48, and the'other .35

parts of the mechanism for feeding the grinding wheel across the work. Thus when stop 142 is out of operation said casing 45 makes a complete revolution at each movement, carrying said rod 47 both up and down, which .will feed the grinding wheeltransversely of the work one step at each reversal of the work-carriage B. When it is desired to traverse the gr nding wheel to grind during the travel of the carriage in one direction only, stop 142 is slid outwardly so that it will also contact with lever 138 when, in a like manner, the brake will be released from engagement with the wheel 133 at the half revolution of shaft 44 so that said rod 47 will be operated, only in one direction, either up or down, at each reversal of the carriage. Thus when the carriage starts to reverse in the grinding direction the crank will pull said rod down and feed the wheel over transversely of the work and when the carriage starts back to the other end of the work the casing 45 will make a half revolution to slide said rod 45 upward ready to engage and traverse the grinding wheel when the carriage is again reversed at the starting end.

At each reversal of the mechanism for traversing the grinding wheel transversely of the work? the crank-rod 126 is operated to turn-the wheel 122 and'through the worm 120 turn the wheel 119 andthe shaft C carrying the pinions 117 and 217 ,-'which engage with the toothed racks on the outer rear ends of the pivoted hood C and the frame C and operate to lower track 0 and feed the grinding wheel down one step intov the work. Thus at each longitudinal mov'ementofthe work-carriage the grinding wheel may be moved one step across the work and at each point of reversal of 'the movement of the grinding-wheel carriage said grinding-wheel 1s 'fed'one step into the work the operation continuing continuously. and automatically until the results desired have been accomplished. The general operation of the machine may be recapitulated, as fo lows: The power 'is i applied to driving sha 6 and through the system of belts before described to the coun-; ter-shaft '15. By the arrangement of the shifting levers, belts 13, .19 and 22 may be shifted back and. forth on the driving pulleys 14 and 18 and the idler pulleys'17, 18 and 18 to secure the driving of said shaft 15 and the reversal of its motion, the speed in both direct-ions being the samefwhen driven through the belts .19 and 22 and the speed in one direction being slow and in the f other direction fast when driven through the. 111edium,o f the bolts ,13 and 22. The differential gear connecting shaftsfiand 26 enables the speed to .be-varied when driven through-the belts 19 and 22. The connection between shaft 15 and the gearin for traversing the work-carriage back and To and also-for the operation of shaft 44 has been fully described and need not be repeated. The belt for driving the grinding-wheel has also been before traced in. its. course from the main driving-shaft 6 and it will be noted by an examination of Fig.' 2 that saidgrinding wheel shaft 1* is 'connccted by a spline with its pulley 2 and thus provision is made for the transverse. movement ofthe' grinding wheel frame, as operated from the shaft 44 through the medium of the reciprocating rackbar 48 on the upper end of pitman rod 47. The rackand-pinion connection between the segment on the rear edges of. the hood C? and the frame C insure an even movement of the grinding wheel shaftl and the section 1*,

but any variation is provided for by the flexible coupling by which said two shafts are coupled together. 7

As is usual, in this class of machinery,

.provision is made for carryingwater to the to-be discharged adjacent to the grinding wheel onto the work in the usual manner. The water running through the various guttors in the frame is collected and discharged through a spout S into the tank T, being strained through a strainer S and used over again.

Having thus fully described my said. invention, what I claim. as new and desire to secure by' Letters Patent, is:

1. A grinding machine comprising a frame or base, a work-carriage mounted to traverse thereon, a pivoted frame mounted above said worlccarriage, a grinding wheel shaft journaled in hearings on said pivoted frame, means for tilting said frame on its pivot to adjust the grinding wheel toward and from the work, an automatic feeding mechanism. connected with, said means, means for traversing the work-carriage, gearing connecting the several parts with the power shaft, and said power shaft, substantially as set forth,

2. A grinding machine comprising a base rovided with suitable bearin s and saw-,1.

mechanism, suostantially as set forth.

ports for the other parts of the mechanism, the work-carriage mounted to traverse on said base, a grinding wheel frame pivoted above said work-carriage, a grinding wheel mounted on a shaft journaled in said pivoted frame, means for feeding said frame step by step transversely of the worl 'means for feeding the wheel into the work, means for traversing the work-carriage, gearing connecting the several sets of mechanism with a driving shaft, and said drivin shaft, substantially as set forth.

- 3. A' grinding machine comprising a base provided with a track for the work-carriage and appropriate bearings and suppdrts for the other parts of the mechanism, a workcarriage mounted to traverse on said base, a grinding wheel frame pivoted on suitable supports on said base, means for traversing said grinding wheel frame transversely of the work, a grinding wheel with. its shaft journaled in said frame, means for feeding said grinding wheel to the work, means operated by the w rk- ':arriage for controlling the feed of said wheel, gearing connecting the several sets of mechanism with a driving shaft, and said driving shaft, substantially as set forth.

4. A grinding machine comprising a base provided with suitable bearings and sup ports for the various parts, a work-carriage mounted to traverse on said base, means for traversing said carriage a grinding wheel frame pivoted on supports adjacent to said \vork-carriage, a grinding wheel on a shaft join-lulled in hearings on one side of the pivot of said frame, a balancing weight on the other side of the pivot of said. frame, means for feeding said. grinding wheel to the work, means for traversing said grind ing wheel across the work, gearing connecting the several sets of mechanism to driving shaft, and said driving shaft, substantially as set forth. a

'5. A grinding machine comprising a base provided with suitable bearings and supports for the other parts, a work-carriage mounted to traverse thereon, a pivoted and substantially balanced grinding wheel frame ,mounted thereon, a grinding wheel carried by said pivoted frame, means for adjusting said wheel in relation to the work and means for moving said wheel transversely of the work, substantially as set forth.

6. A. grinding machine comprising a base, a work-carriage mounted thereon, a grinding wheel frame pivoted on supports adjacent to said work-carriage carrying the grinding wheel on one end and a counterbalancing weight, on its other end, an automatic feed mechanism for feeding the grindingwvheel across the work step by step and for feeding it into the workstep by step at each reversal of the carriage, and driving 7 A grinding machine comprising a base provided with suitable supports and bearings for the other parts, a work-carriage mounted to traverse longitudinally on said base, a pivoted grinding wheel frame mount ed adjacent to said base and formed with a bearing face or shoe, a pivoted hood or frame mounted adjacent .to said grinding wheel frame and provided with a track against which said shoe may hear, an overbalancing weight for holding said contact with said track, means engaging with one end of said hood. or frame for adjusting it and securing it in adjusted position on its pivot, the grinding wheel carried on said grinding wheel frame, and the vari ons operating mechanisms, substantially as set forth.

8. .Pi grinding machine comprising a base provided with suitable bearings and supports for the other parts, a work carriage mounted to traverse thereon, a grinding wheel frame mounted to pivot and traverse transversely of the work-carriagc, a grinding wheel carried on one end of said frame, a weightfor normally holding said grinding wheel,.awayfronf the work, a pivoted frame adjacent to said. grinding, wheel frame formed with a face against which a part of.

and i said grinding wheel. frame may hear slide, segmental reason the opm of said pivoted frame, a sha ft, pii. said shaft engaging with sr racks, gear ng for turning shaft to ad ust said frame to feed ing wheel to the work, and mee (merating the several. parts, suhsnnfitie' set forth.

provi d with em ports for theseverai end n acnine coinpr me i' g w.

ole tatin parts, a nshoe in mounted thereon, a grindin wheel frame pivoted adjacent to said wor r-carriage and provided with an over-balancing weight on one end, a grinding wheel mounted on its op- "posite end, a rocking frame mounted adja cent to said grinding wheel frame adapted to bearagainst the same for holding it nected thereto by a sliding connection,

means for adjusting said grinding wheel toward and from the work, and mechanism for operating the several parts, substantially as set forth.

11. A grinding machine comprising a base provided with suitable bearings and supports for the various parts, a work-carriage mounted to traverse back and forth upon said base, gearing connected with said work-carriage for traversing it in either direction, shifting mechanism for throwing the gearing into action for traversing it in either direction, a trip lever for operating said shiftinomechanism arranged to be operatecl'by' he movement of the carriage,

' means connected with said carriagafor operating said trip lever, a grinding wheel, a grinding wheel frame, and means for pivoting said frame above the work, substantially as set forth.

12-. A grinding machine comprising a base provided with suitable bearings and sup: ports for the various parts, a work-carriage mountedzto traverse back and forth thereon,

I traversing mechanism, means for reversing the motion of: sa1d traversing mechan sm,

said means comprising a counter-shaft carrying a multiple series of fast and loose pulleys of-various sizes, belts running'there from. to the driving shaft, and means for shifting the driving belts from the fast pul leys ,tofthe loose pulleys either on the same series or different series, whereby the carriage mayQhedr'iwen at the same speed in both directions or onelspeed in one direction and another speed in the reverse direction, substantially as set-foflith.

.13. A. grinding machine comprising a base provided with suitable bearings and supports for .the various. parts, a work-carriage vmounted to traverse thereon, gearing for traversing said carriage, means for reversingthe directlon of the motion of said gearing comprising a counter-shaft carrying a series of fast and loose pulleys part of which are of one size and part of which are of an other size, a series of belts mounted on said pulleys and running to the driving shaft, part of said belts being geared to drive in one direction and part todrive in the reverse direction, and means for throwing a driving belt on a fast pulley of either size and leaving the other belts on the loose pulleys, sub stantially as set forth. I

14. grinding machine comprising a base provided with suitable bearings and supports for the various parts, a work-carriage mounted to traverse back and forth thereon, gearing fortraversing the carriage comprising a counter-shaft geared to the carriage operating mechanism, a series of fast and loose pulleys thereon part of which are of one size and part of which are of another size, belts connecting said pulleys to the driving shaft, pivoted shifting levers for controlling the position of said belts in re-" lation to the pulleys, said levers being provlded wit-h angle arms carrying projecting parts adapted to engage with cam slots in a sliding operating bar, said sliding operating bar, a trip lever connec-ted'with said bar,

said lever being located adjacent to the carriage, and dogs adjustably secured to said carriage for contact with said'lever' to operate the same, substantially as set forth.

15. A grinding machine comprising a base provided with suitable bearings and supports for the various parts, a work-carriage mounted thereon, means for traversing said work-carriage back and forth, a grinding wheel frame pivoted on a shaft mounted in supports on said base and adapted to slide thereon, a screw engaging with a nut mounted in said frame for adjusting it transversely, a pawl-andratchet connection on the outer end of said screw, a reciprocating rack-bar for operating said pawl and through said pawl the ratchet and screw, said reciprocating rack-bar being connected to a crank on a shaft operated by the carriage operating gear, said shaft, and means for operating the same, substantially as set forth.

16. A grinding machine comprising a base providedwith suitable bearings and supports for the various parts, a work-carriage mounted thereon, gearing for traversing said carriage back and forth, a grinding wheel frame mounted to pivot and slide on a transverse shaft adjacent to said work j carriage, a transverse screw engaglng with a nut carried by said frame for adjusting said frame transversely, and means connect cd with the gearingfor traversing the carriage for operating said screw, substantially. as set forth. I 17. A grinding machine coinprlsing a base provided with suitable bearings and supgrinding wheel frame, substantially as set Cir forth.

24:- A grinding machine comprising abase provided with suitablebearings and supports for the various parts, a work-carriage mounted thereon, means for traversing said worlccarriage back and forth, a grinding wheel frame mounted to pivot and slide on a transverse shaft adjacent to said workcarria e, screws engaging with loosely mounted nuts in said grinding wheel frame, means for locking said nuts interchangeably comprising a double ended. pivoted pawl, gearing connecting said screws, gearing for driving said screws at each reversal of the work-carriage, and means for operating said pawl at the desired point comprising an adjustable strike carried on a frame adjacent to the grinding wheel frame and connected to rock the shaft carrying said pawl, and means connected with the same mechanism for feeding the grinding wheel to the work, substantially as set forth.

25. A grinding machine comprising a base provided with suitable hearings and supports for the other'parts, a work-carriage thereon, a grinding wheel frame mounted to slide and pivot on a supporting shaft adjacent to said carriage, screws for sliding said grinding wheel frame on said supporting shaft, nuts loosely carried by said frame with which said screws engage, a pawl mounted on a rock-shaft for engaging and locking said nuts interchangeably, an adjustable strike adjacent to the frame arranged to rock said shaft and throw said pawl to lock said nuts interchangeably at pre-determined points in the transverse movements of said frame, and mechanism for operating the several parts, substantially as set forth.

26. A grinding machine comprising a base provided with bearings and supports for the other parts, a work-carriage thereon, a grinding wheel frame mounted to slide on a supporting shaft adjacent to said carriage, loosely mounted nuts carried by said frame, operating screws geared to run in opposite directions and mounted in said nuts, means for locking said nuts from rotation, interchangeably, and means for operating said. lockingmeans connected to be operated by the movement of the frame at predetermined points, substantially as set forth.

27. A. grinding machine comprising a base provided with suitable bearings and supports for the various parts, a work-carriage mounted to traverse back and forth thereon, means for traversing said work-carriage, a grinding wheel frame mounted to pivot and slide on a transverse shaft adjacent to said work-carriage, screws for sliding said grinding wheel frame on said supporting shaft, means for operating the said screws at each reversal of the work-carriage interchangeably, means for reversing the niotion omes? of the grinding wheel frame at the desired limit of its transverse motion, and means operated by the grinding wheel frame for feeding the grinding wheel to the work, substantially as set forth.

28. A grinding machine comprising a base provided with suitable bearings and supports for the various parts, a work-carriage, means for traversing said work-carriage, the grinding wheel frame mounted to slide on a shaft adjacentto said work-carnage,

screw gear for traversing said grinding wheel frame across the work, a rack-bar for operating said screw gear through a pinion thereon, said rack being mounted on a crank on the outer end of a shaft connected with the carriage operating gear, said crank comprising a block mounted to be adjusted toward or from the axis of said shaft, and means for effecting said adjustment, substantially as set forth.

29. A grinding machine comprising a base provided with suitable bearings and supports for the various parts, a work-carriage mounted thereon, gearing for traversing said work-carriage back and forth, a grinding wheel frame mounted to slide on a shaft across the work, means for traversing said frame, a connection from the gearing operating the work-carriage to the gearing for traversing the grinding wheel frame comprising a crank wheel on the outer end of a shaft geared to the carriage operating mechanism, arack-bar extending from the crank-pin of said crank wheel to a pinion for operating the said grinding wheel frame traversing mechanism, said crank wheel comprising a frame connected to its shaft by a slipping connection, means for holding said frame to the shaft under tension, means for limiting the rotation of said frame either at a half or a complete revolution thereof, and means for releasing the grip between said parts at the point of reversal, substantially as set forth.

30. A grinding machine comprising a base provided with suitable bearings and supports for the various parts, a work-carriage mounted to traverse back and forth thereon, gearing for traversing said work-earriage, a grinding wheel frame mounted to slide on a transverse shaft adjacent to said work-carriage, means for traversing said grinding wheel frame across the work operated through a rack-bar and pinion, said rack-bar being connected to a crank on a crank wheel on a shaft geared to the carriage operating mechanism, said crank 

